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Cross-platform market coverage narrows sharply when recent pricing is required

Predictions.io's November 1 comparison tracks 2,927 open Polymarket questions with 6.3 billion dollars in volume on open markets, against 6,431 open Kalshi questions with 2.3 billion dollars. Of the 273 closest matches still open on both venues, 75 carried a price on each side synced within the last 60 minutes.

Predictions.io’s November 1 comparison shows a split between Polymarket and Kalshi: Polymarket had more volume on open markets, while Kalshi had more open questions.

According to Predictions.io, Polymarket had 2,927 open questions and 6.3 billion dollars in volume on open markets. Kalshi had 6,431 open questions and 2.3 billion dollars.

Matched questions and recent prices

The comparison tracked 1,723 validated matches between Polymarket and Kalshi on November 1. The update was published on Nov 1, 2026, at 2:45 PM ET.

Among the 273 closest matches that remained open on both venues, 75 had a price on each side synced within the last 60 minutes, according to Predictions.io.

Those figures distinguish the broader set of validated matches from the narrower group with recently synced prices on both platforms. A matched question alone does not establish that both prices meet that recency condition.

What it means for prediction markets

  • Market count and volume point in different directions: Kalshi had more open questions, but Polymarket carried more volume on open markets.
  • Recent two-sided pricing covers a smaller set: Only 75 of the 273 closest matches still open on both venues met the stated 60-minute syncing condition.
  • The snapshot does not establish price gaps: The supplied figures describe coverage and pricing recency, not the size or direction of differences between matched contracts.
KalshiPolymarketInfiniti MarketsInfiniti Signals

Sources & attribution

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    Predictions.iopredictions.io
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    https://predictions.io
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